Implemented `hue rename <light-num> <light-name>`.

This change requires the matching change in my fork of hue.js
to support the API call that renames lights.
Bumped the version of hue.js in the deps to the latest, which has support
for rename. Bumped package version in prep for release.
Merge pull request #2 from ceejbot/rename

Implemented `hue rename`
Update readme.md

Clarify hostname syntax in .hue.json
Merge pull request #3 from calebsexton/patch-1

Update readme.md
--save and windows fix
bump
windows fix
bump